Accelerated myocardial metabolic and functional recovery with terminal nicorandil-Mg cardioplegia in heart transplantation.

Abstract:

:Cardiac reperfusion injury after heart transplantation or cardiopulmonary bypass has been difficult to control due to the variable degree of myocardial damage with respect to the length of ischemia and the complexity of the surgical procedure. Here, we evaluated the myocardial metabolic and functional recovery of hearts infused with a nicorandil vasodilator-magnesium (Mg) solution just prior to reperfusion (terminal cardioplegia). Donor hearts (20 dogs) were removed and immersed in a 4 degrees C water bath containing 20 mEq/l KCL-5% glucose for 6 hours, and then were transplanted to recipient dogs. Orthotopically transplanted dog hearts were either reperfused without any further treatment or received a terminal cardioplegic solution containing 8 mg/l nicorandil, 30 mEq/l Mg, and 50 g/l glucose, which was infused at a pressure of 75 cm H2O for 2 minutes. During the reperfusion period, myocardial tissue PCO2 (t-PCO2) and calcium ion (t-Ca) were continuously monitored by an ISFET (ion-sensitive field effect transistor) sensor. Myocardial oxygen consumption and lactate flux were calculated/monitored at 5, 10, 20 and 40 minutes of reperfusion. Thereafter, myocardial function was evaluated at 45 minutes of reperfusion using LVSWI. Just after reperfusion, the treatment group (group B, n = 10) had a significantly greater coronary flow than the control group (Group A, n = 10, 35.0 +/- 10.1; group B, 47.4 +/- 8.5 ml/100 g/min, p less than 0.025).(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Cardiovasc Drugs Ther

authors

Orita H,Shimanuki T,Fukasawa M,Abe H,Kuraoka S,Hirooka S,Washio M

doi

10.1007/BF03029747

subject

Has Abstract

pub_date

1991-08-01 00:00:00

pages

727-32

issue

4

eissn

0920-3206

issn

1573-7241

journal_volume

5

pub_type

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